Offset-preventing mechanism for printing-presses.



No. 748,135. PATENTBD DEC. 29, 190E.

. H. A.1W.. WOOD. oEEsET PREVENTING MECHANISM FOR-PRINTING RESSES.

AEPLioATIoN EILED SEPT. 21, 1896. RENEWED MAY 90s HOMODEL. V r

3 SHEETS-SHEET 1.

Witnesses. I inventor, WQ K L, H.A'.W.Wood. X 3? 3 MEE W Attorneys,

m: moms Ptrzns co. momumm. wAsumcTQN, 01c.

I No. 748,135.

PATENT-EDDE'E. 29, 1903.

I A. W. WOOD. oEEsET PREVENTING MECHANISM FOR PRINTING PEEssEs';

APPLICATION EILED sEPT. 21. 1896, RENEWED MAY 8. 1903. N0 MODEL. sEHEET$-EHEET 2.

I nve ntor. H. A.W.'W00d- *1 I )Xyidfid Attorney-8 Witnesses.

PATENTEDDEG. 29,1903.

' H. A. W. W001).. OFFSET PREVENTING MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED SEPT. 21, 1896. RENEWED MAY 8. 1903.

' a SHEETS-SHEET a N0 MODEL.

Inventor HAWWoodf Wurisses Attorney-3.

UNITED STATES Patented December 29, 1903.

PATENT OFFICE.

HENRY A. WISE WOOD, OF NEW YORK, N. Y., ASSIGNOR TO THE CAMPBELLPRINTING PRESS AND MANUFACTURING COMPANY, OF NEW YORK, N. Y., ACORPORATION OF NEW YORK.

OFFSET-PREVENTING MECHANISM FOR PRlNTlNG-PRESSES.

SPECIFICATION forming part of Letters Patent No. 748,135, dated December1903- Application filed September 21, I896- Renewed May 8,1903. SerialNo. 156.280. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. WISE WOOD, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented a new and useful Improvement in Offset-PreventingMechanism for Printing-Presses, of which the following is aspecification.

The object of my invention is to provide simple and efficient devicesfor preventing offset in printingpresses.

An oifset-preventing device constructed according to my invention isespecially applicable to the ordinary double-cylinder sheet-perfectingprintingpress. In a press of this character the side of each sheetprinted by the first impression-cylinder necessarily comes in contactwith the second impression-cylinder when the second side of the same isprinted.

Ink from the freshly-printed side of the sheets will therefore be set03, as it is called, on the surface of the second impression-cylinder,and the ink thus set oif is apt to be 011"- set onto the succeedingsheet or sheets, proz5 ducing blurs or blots upon the first printedside.

In its preferred form an ofiset-preventing device constructed accordingto my present invention is arranged to handle a plurality ofoffset-sheets, preferably two sheets being employed, and is providedwith sheet-transferring devices and devices for rendering theoffset-sheets capable of further use, which are arranged to cooperate sothat one oEset-sheet will be secured upon the surface of the secondimpression-cylinder of a printing-press while the other offset-sheet isbeing rendered fit for further use.

In the accompanying three sheets of drawings, Figure 1 is a partial sideview of a printing-press provided with ofiset-preventing devicesconstructed according to my invention. Fig. 2 is a sectional view of thesame. Figs.

3 t0 6, inclusive, are diagrammatic views illustrating dilferentrelative positions of the offset-sheets; and Figs. 7 and 8 are detailviews illustrating the mechanism which I preferably employ for actuatingthe sheet-gripping devices.

An offset-preventing device" constructed so according to my inventioncomprises means whereby at intervals of a number of rotations of animpression-cylinder an offset-sheet will be taken from theimpression-cylinder and another sheet supplied thereto, the sheet thus 55 removed being held and so manipulated that at the end of one of saidintervals the same will be transferred back onto the impressioncylinderand the sheet then on the impression-cylinder removed, so that said twosheets will be alternately transferred onto and from saidimpression-cylinder. When the sheets are not on the impression-cylinder,the same are preferably subjected or acted upon by devices which willrender the same capable of further use.

In its prefered form my ofiset-preventing device comprisesascrubbing-cylinder havin g sheet-cleaning devices codpei'atingtherewith, two transfer-cylinders, one transfercylinder being arrangedto strip an ofisetsheet from the impression-cylinder of a printing-pressand to transfer the same to the scrubbing-cylinder and the secondtransfercylinder being arranged to strip the 0E- set-sheet from thesurface'of the scrubbingcylinder and transfer the same back to theimpression-cylinder. By adopting this arrangement and employing twoofiset-sheets on offset-sheet maybe secured in place on the surface ofthe impression-cylinder while the second ofiset-sheet is being scrubbedor cleaned.

Mounted in the cylinders of my oifset-preventing devices are theordinary sheet-grippers, and said sheet-grippers are connected so thatthey will be actuated only when a number of sheets have been printed. Bymeans of this construction an offsetsheet will be kept upon theimpression-cylinder until it has become soiled, when it will be stripped0d and cleaned, a new or clean sheet being automatically provided forreplacing the olfset sheet which is removed.

Referring to the drawings and in detail, A designates the ordinary sideframes of a printing-press; B, the bed thereof; 0, the firstimpression-cylinder; D, the second impression-cylinder; E, a feed-board,and F a flydelivery mechanism for removing the printed sheets from thesecond impressioncylinder and depositing the same upon a delivery-tableGr. These parts may be of any of the ordinary or approved constructionsand need not be herein described at length.

Journaled in the side frames of the press substantially over the secondimpression-cylinderis acylinder H, which I term the scrubbing-cylinder.

Cooperating with the cylinder H, I provide sheet scrubbing or cleansingdevices. In their preferred construction these cleansing devicescomprise a fountain K, which is arranged to deposit a supply of oil andbenzene on the surface of the soiled offset side by means of the rollers10, 11, and 12. Instead of using oil and benzene other cleansing fluidsmay be used.

Engaging with the scrubbing-cylinder H and preferably driven inopposition thereto are a plurality of scrubbing or cleansing rolls. as13 and 14, which engage a common roller 15. Two transfer-cylinders I andJ are arranged to cooperate with the scrubbingcyl-' inder H and theimpression-cylinder D, the cylinder I being arranged to strip the soiledoffset-sheet from the surface'of the impression-cylinder D and transferthe same to the scrubbing-cylinder H, the second transfercylinderJ beingarranged to strip the cleansed oifset-sheet from the surface of' thescrubbing-cylinder H and transfer the same back to the surface of thecylinder D.

Mounted in the impression-cylinder D in addition to the usualgrippers-for the printed sheet are a set of grippers 16 for engaging theoffset-sheets.

The transfer-cylinder I, the scrubbing-cylinder H, and the secondtransfer-cylinder J are provided with sets of grippers 1'7, 18, and

19, respectively.

The gearing for driving the'parts may be arranged in any preferred ordesired manner.

As shown most clearly in Fig. 1, 20 and 21 designate the ordinary gears,carried by the impression-cylinders C and D.

The transfer-cylinders I and J are provided with gears 22 and 23, whichmesh with and are driven from the pression-cylinder D.

The scrubbing-cylinder H is provided with a gear 24, which meshes withand is driven from the gears 22 and 23.

The oil-depositing rollers 11 and 12 are preferably driven by theirfriction against the scrubbing-cylinder; but,"if desired, they may bepositively driven in any desired manner.

Secured upon the end of a shaft of the roller gear 21 of the im- 15 is agear 25, which meshes with and is driven from the gear 24.

The scrubbing-rollers 13 and 14 are preferably frictionally driven fromthe roller 15; but, if desired, these rollers may be positively gearedtogether.

The four sets of grippers 16, 17, and 18 for handling the oEset-sheetsare preferably arranged to act only after a plurality of sheets havebeen printed by the press. Each of these sets of rippers is secured upona rock-shaft in the ordinary manner, which is provided at its end with acam 26, having a slot or groove 27 formed therein, as most clearlyillustrated in Fig. 8. A movable carriage 28 is mountedinside of theframework of the press and is provided with a plurality of projectingpins 29, which may be brought into position to actuate the grippers. Thecarriage 28 will be shifted into operative position by means of abell-crank lever 30, connected to a link 31, having a roller 32journaled thereon in position to be operated bya cam 33. The cam 33 ispreferably geared to turn once for every twenty sheets printed on thepress. As shown, the cam 33 is secured upon a shaft 34, having aworm-wheel 35 secured thereon which is driven by means ofa worm 36. TheWorm 36 is driven by means of bevel-gears 37 and 38, the bevel-gear 38being secured upon a cross-shaft which may be driven in any desired orpreferred manner from the ordinary parts of the printing-press. Thecarriage 28 is normally held in its retracted or inoperative position bymeans of a spring 39, connected to the link 31.

The operation of my oifsetpreventing mechanism is most clearlyillustrated in the diagrammatic views shown in Figs. 3 to 6, inclusive.As shown in Fig. 3,one offset-sheet a, shown in heavy lines, is beingstripped from the surface of the impression-cylinder D by the firsttransfer-cylinder '5, while a second ofiset sheet I) is being strippedfrom the scrubbing-cylinder H by the second transfer-cylinder J. In Fig.4 the soiled offset-sheeta is beingtransferred tothesurfaceofthescrubbingcylinder H and the second offset sheet is beingtransferred to the impression-cylinder D. The soiled offset-sheet willbe retained upon fihe scrubbing-cylinder H while a number of sheets arebeing printed by the press, and the soiled oEset-sheet has time to bethoroughly cleaned. As shown in Fig. 5, the offset-sheet a, has passednearly onto the surface of the scrubbing-cylinder H and the offset-sheetb has passed substantially onto the surface of the secondimpression-cylinder B. In Fig. 6

the offset-sheet a is being transferred back to the impression-cylinderD while the offsetsheet I) is being transferred to thescrubbingcylinder.

Iam aware that many changes may be made in offset-preventing devices bythose who are skilled in the art and that certain parts of my inventioncan be used in difierent locations and in connection with differentforms of printing-presses without departing from the scope of myinvention as expressed in the claims. I do not wish, therefore, to belimited to the constructions which I have shown and described; but

What I claim, and desire to secure by Letters Patent of the UnitedStates, is

1. In a device of the class described, the combination of an impression-cylinder, means for supplying an oifset-sheet to said cylinder,and removing another offset-sheet from said cylinder, and then, at aninterval of a number of impressions, transferring the sheet previouslyremoved back to the impression-cylinder, and removing the sheet then onthe impression-cylinder.

2. In a device of the class described, the combination of animpression-cylinder of a rintin -nress means for automatically su i p aI a plying said cylinder with an ofiset-sheet and removing anoffset-sheet therefrom, and, at an interval of a number of impressions,removing the sheet thus supplied to the impressioncylinder, andrestoring the sheet previously on the impression-cylinder, and means formaking said offset-sheets capable of further use while removed from theimpression-cylinder.

3. In a device of the class described, the combination of animpression-cylinder of a printing-press, a cylinder as H, and means forautomatically transferring two offset-sheets back and forth between saidimpression-cylinder and said cylinder H at intervals of a number ofimpressions.

4. In a device of the class described, the combination of animpression-cylinder of a printing-press, a cylinder asH, means forantomatically transferring two ofiset-sheets back and forth between saidimpression-cylinder and said cylinder H at intervals of a number ofimpressions, and means for rendering the offset-sheets capable offurther use While on the cylinder H.

5. In a device of the class described, the combination of animpression-cylinder of a printing-press, devices for renderingoffsetsheets capable of further use, and means for automaticallytransferring offset-sheets back and forth between theimpression-cylinder and said devices.

6. The combination of an impression-cylinder of a printing-press,cleaning devices and sheet-transferring devices arranged so that oneofiset-sheet will be secured upon the surface of the impression-cylinderwhilea second oifset-sheet is being cleaned.

7. The combination in a perfecting printing-press of the twoimpression-cylinders, a cylinder as H arranged in connection with thesecond of said impression-cylinders, cleaning devices cooperating withsaid cylinder H, and devices for transferring ofiset-sheets back andforth between said second impressioncylinder and said cylinder H.

8'. In a device of the class described, the combination of animpression-cylinder of a printing-press, a scrubbing-cylinder and twotransfer-cylinders,one being arranged to strip a soiled oEset-sheet fromthe impression-cylinder and to transfer the same to the scrubbing-cylinder, and the second being arranged to strip an offset-sheet fromthe scrubbingcylinder and to transfer the same to theimpression-cylinder.

9. The combination'of an impression-cylinder of a printing-press,sheet-cleaning devices and transfer devices arranged so that oneofiset-sheet will be secured upon the impression-cylinder while a secondoifset-sheet is being cleaned, and means for operating the transferdevices only when a number of sheets have been printed.

10. The combination of an impression-cylinder of a printing-press, ascrubbing-cylinder, cleaning devices cooperating with saidscrubbing-cylinder, transfer-cylinders, grippers mounted in theimpression-cylinder, the scrubbing-cylinder and the transfer-cylinders,a movable carriage having projecting pins for actuating said grippers,and means for bringing said carriage into operative position when anumber of sheets have been printed, said parts being arranged tocooperate so that one offset-sheet will be secured upon theimpression-cylinder while a second offset-sheet is being cleaned.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

H. A. WISE WOOD.

Witnesses:

HENRY W. COZZENS, .Tr., LOUISE PEOKHAM.

